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4.0 SAMPLE CUSTODY AND DOCUMENTATION <br /> Sample custody and documentation procedures will be followed according <br /> to Section 4.3.3 of the Current Work Plan. <br /> 5.0 ANALYTICAL REQUIREMENTS <br /> 5.1 Field Analyses <br /> A separate sample container will be used for measurement of <br /> temperatures, pH, and specific conductivity to minimize cross- <br /> contamination. The measurements will be taken immediately after the water <br /> is collected and in accordance with the guidelines of Section 4.3.2.1 of <br /> the Current Work Plan. <br /> 5.2 Laboratory Analyses <br /> The samples will be filtered through 0.45-micron millipore filters and <br /> acidified with 1N nitric acid at the laboratory. However, samples to be <br /> analyzed for hexavalent chromium will be filtered, but not acidified. All <br /> of the samples will then be analyzed for concentrations of arsenic, total <br /> chromium, hexavalent chromium, copper, and zinc in accordance with EPA's <br /> 1986, "Test Methods for Evaluating Solid Waste" , (EPA SW-846) or EPA's <br /> 1979, "Methods for Chemical Analysis of Water and Wastes, " (EPA <br /> 600/4-79-020) as listed below. <br /> Contaminant Analytical Method <br /> Arsenic EPA SW-846 #7060 <br /> Chromium, Total EPA SW-846 #7191 <br /> Chromium VI EPA SW-846 17195 <br /> Copper EPA SW-846 #200.7 <br /> Zinc EPA 600/4-79-020 1289.2 <br /> For the analytical results to be most useful, they must be able to be <br /> compared to the applicable requirements for the constituents of concern. <br /> The analytical method detection limits need to be at least as low as the <br /> 4 <br />